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(2x+y)(2x-y)-(3x-2y)(x+y)-y(2x-y)
=(4x^2-y^2)-(3x^2-2xy+3xy-2y^2)-(2xy-y^2)
=(4x^2-3x^2)+(2xy-3xy-2xy)+(-y^2+2y^2+y^2)
=x^2-3xy+2y^2
若是因式分解,再等下去
=(x-y)(x-2y)
=(4x^2-y^2)-(3x^2-2xy+3xy-2y^2)-(2xy-y^2)
=(4x^2-3x^2)+(2xy-3xy-2xy)+(-y^2+2y^2+y^2)
=x^2-3xy+2y^2
若是因式分解,再等下去
=(x-y)(x-2y)
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展开全部
(2x+y)(2x-y)-(3x-2y)(x+y)-y(2x-y)
=4x^2-y^2-(3x^2+xy-y^2)-(2xy-y^2)=4x^2-y^2-3x^2-xy+y^2-2xy+y^2
=x^2-3xy+y^2
=4x^2-y^2-(3x^2+xy-y^2)-(2xy-y^2)=4x^2-y^2-3x^2-xy+y^2-2xy+y^2
=x^2-3xy+y^2
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